Help me troubleshoot my Aspire A715-75G's display connector

[windorey]

Hello,

My Aspire A715-75G's display cable got snapped,
I thought a cable I have from an Aspire A315-56 would be compatible, seeing the same pinout in the schematic.

Very stupidly, without checking boardview files, I just connected my cable to my LCD panel and to my motherboard and suddenly the cable became very hot, and let out the magic smoke.

I have realised that the pinouts are the same, but mirrored, so I plug in the cable in reverse ( to mirror the pins ), but the motherboard doesn't turn on at all with it plugged in.

When the cable's unplugged, the motherboard seems to boot up all right (no display to confirm though) and the backlight power gives me 19V while the LCDVDD gives me 0V.
Why does the motherboard not show a power LED with the connector in the right orientation, but show an LED with it in the wrong orientation?

I have linked the schematic of both motherboards for convenience. Thank you in advance for any help.

1. https://www.badcaps.net/forum/troubl...ompal-la-j861p
2. https://www.badcaps.net/forum/troubl...c-acer-a315-56

[pdblues2231]

hi,
do you get a picture via hdmi ? I would replace the cable and then continue troubleshooting .

[windorey]

I don’t get any image on the HDMI port, the laptop doesn’t usually output the BIOS to HDMI though.

I sadly don’t have an SSD with an OS at the moment.